Keyphrases
- conjunctive queries
- query answering
- query evaluation
- integrity constraints
- data complexity
- np complete
- query language
- special case
- data exchange
- query containment
- query rewriting
- decision procedures
- probabilistic databases
- containment of conjunctive queries
- datalog programs
- expressive power
- database
- boolean expressions
- conjunctive query containment
- normal form
- regular path queries
- unions of conjunctive queries
- tuple generating dependencies